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ENT > Ear-inner Ear > Flashcards

Ear-inner Ear Flashcards

1
Q

Inner ear Also known as

A

Labyrinth

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2
Q

Two parts of the labyrinth

A

Membranous and Bony

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3
Q

Which fluid is it inner ear filled with

A

Endolymph

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4
Q

Endolymph is produced by

A

Stria vascularis

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5
Q

Endolymph absorbed by

A

Endolymphatic sac

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6
Q

Inner ear surrounded by which fluid

A

Perilymph

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7
Q

What is the Perilymph composed of

A

CSF

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8
Q

How does the CSF go to the inner ear to become perilymph

A

Through the aqueduct of cochlea

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9
Q

Relative potassium and sodium levels in endolymph and perilymph

A

Endolymph- high K low Na

Perilymph- high Na low K

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10
Q

Sensory end organ of cochlea

A

Organ of corti

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11
Q

How many turns does cochlea have

A

2and3/4

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12
Q

What is the apex and the basal turn sense what frequencies

A

Apex – senses low-frequency sounds

Basal turn – senses high frequency sounds

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13
Q

Apex of the cochlea is also known as

A

Helicotrema

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14
Q

What is the axis of the cochlea also known as

A

Modiolus

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15
Q

Sections of cochlea

A

Scala vestibuli
Scala media
Scala tympani

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16
Q

Membranes in the cochlea

A

Reissner’s membrane
Tectorial membrane
Basilar membrane

17
Q

Organ of corti present on which membrane

A

Basilar membrane

18
Q

Travelling wave theory given by

A

Von bekesy

19
Q

Connection between cochlea and saccule

A

Ductus reuniens

20
Q

What does the utricle and saccule also known as

A

Vestibule

Otolithic organ

21
Q

What is the function of the utricle and the saccule

A

Utricle controls horizontal linear balance

Saccule Controls vertical linear balance

22
Q

Sensory end organ of vestibule

A

Macula

23
Q

Where are the otoconia is present

A

Macula

24
Q

Main pathology of BPPV

A

Benign paroxysmal positional vertigo

It is due to displacement of otoconia that reaches the SCC

25
Q

Describe nystagmus in BPPV

A

Several seconds latency
Geotropic
Horizontal – rotatory
Last no more than 30 seconds before abating
Fatigues with repetition of hallpikes maneuver

26
Q

Diagnostic test in BPPV

A

Dix-hallpike manoeuvre

27
Q

Treatment of BPPV

A

Epley’s manoeuvre

28
Q

Types of semi circular canals

A

Lateral
Posterior
Superior

29
Q

Function of semi circular canals

A

Angular balance

30
Q

Sensory end organs of semicircular canal

A

Crista

31
Q

Cupula

A

Crista is covered by gelatinous layer called cupula

32
Q

Bithermal caloric test

A

Used to check the lateral semicircular canal
EAC is irrigated with warm and cold water
Produces nystagmus
Direction – COWS

ENT (34 decks)

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